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Hafni Indriati Nasution
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Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science

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PENGARUH MEDIA e-LEARNING BERBASIS WEBLOG PADA PEMBELAJARAN MODEL KOOPERATIF TIPE TPS (THINK PAIR SHARE) TERHADAP HASIL BELAJAR KIMIA SISWA PADA POKOK BAHASAN STRUKTUR ATOM DAN SISTEM PERIODIK UNSUR Anna Juniar; Ika Trisna Br Karo S; Hafni Indriati Nasution; Nurmalis Nurmalis
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 1 (2014): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (456.909 KB) | DOI: 10.24114/jpkim.v6i1.5477

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Abstract This research was purposed to look at the influence of e-learning based weblog implementation toward the increasing of student’s achievement on subject of atom structure and periodict unsure system. The population of research was all students of XI IPA SMAN 3 Medan which consisted of 9 classes with total of 414 students. By using random sample, 2 classes with total of 80 students was used as sample such that gotten class of 1st experiment was e-learning based weblog with instructional model of TPS cooperative type and class of 2nd experiment was not e-learning based weblog with instructional model of TPS cooperative type. The percentage of student’s achievement was increasing by using e-learning based weblog toward the teaching and learning with instructional model of TPS cooperative type was 77.920% and without it was 66.200%. By using data analysis, t-statistics was 6.267 than t-table was 1.994 where α = 0.05 and dk = 78 such that t-statistics > t-table. So, Ha was accepted and could be concluded that student’s achievement by using e-learning based weblog implementation using instructional model of TPS cooperative type was higher than the student’s achievement without it.  Kata Kunci : e-Learning, Weblog, Think Pair Share (TPS)
Pembuatan Etanol Dari Rumput Gajah (Pennisetum purpureum schumach) Menggunakan Metode Hidrolisis Asam dan fermentasi Saccharomyces cerevsiae Hafni Indriati Nasution; Ratna Sari Dewi; Primajogi Hasibuan
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (499.649 KB) | DOI: 10.24114/jpkim.v8i2.4441

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Abstract. Elephant grass (Pennisetum purpureum schumach) not fully utilized by the people in North Sumatera. Though Elephant Grass containing lignocellulose namely cellulose, hemicellulose and lignin, which can be utilized as a valuable product that is as bioethanol. This research aims to study the benefits of elephant grass (Pennisetum purpureum schumach) to be made by the hydrolysis and ethanol fermentation to determine the effect of sampling sites on the cellulose content of elephant grass (Pennisetum purpureum schumach) is the area Lubuk Pakam, Tuntungan and Stabat; the influence of an acid catalyst H2SO4 and HCl for hydrolysis and fermentation time 2, 4, 6 and 8 days to produce the optimum ethanol. The results showed that the highest cellulose content is sampled area Lubuk Pakam which is further used in the process of hydrolysis. A better catalyst in the process of hydrolysis to produce ethanol that is optimum HCl and optimum fermentation time to produce the highest ethanol content is 6 days with HCl catalyst as much as 27.83%. Keywords: elephant grass, cellulose, catalyst, hydrolysis, fermentation, destilation
Co-Authors Anna Juniar Ika Trisna Br Karo S Nurmalis Nurmalis Primajogi Hasibuan Ratna Sari Dewi